Finding the Fourth Proportional to 1,423.35, 1,962.12 and 1,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.35 : 1,962.12 = 1,128.69 : x
2. Step 2: Convert to fraction form
   1,423.35/1,962.12 = 1,128.69/x
3. Step 3: Cross multiply
   1,423.35x = 1,962.12 × 1,128.69
4. Step 4: Simplify right side
   1,423.35x = 2,214,625.22
5. Step 5: Solve for x
   x = 2,214,625.22/1,423.35
6. Step 6: Final answer
   x = 1,555.92